Scratch

For the past, what, oh I don't know, FIVE months or MORE, I've been working on a huge project called Meteorite. I tried to open it on scratch today, but it said the following:

Could not read project; file may be damaged:
(bad header)

Now at first, I tried to open it in Scratch. It said that. I tried to open it from finder(I have a mac computer)- it said that. No matter what I tried, it said that. Here's some info that I think would help.

1. When I tried to open it in scratch, in the project description, it showed a black screen for what it looked like(last time I checked that wasn't like that) and the description(which I had filled in in a previous time) was completely EMPTY.

2. The project was 3.7 MB(just to show you how huge it was).

3. Today, when I looked at it in finder, the scratch logo(that it typically shows) wasn't on top of the paper(you know how it looks in finder if you have a mac). When I looked at time machine, it didn't have the logo until I looked all the way back on June 13. The other days from the 14 of June on had not the scratch logo, but just the letters SB in bold on the paper.

4. The last time I had edited the project was on June 12.

Does anyone know what I can do to restore it? I think there might be a way in time machine, but I don't want to try anything before I know for sure.